发泡用水对泡沫沥青流变性能的影响

Effect of Foaming Water on the Rheological Properties of Foamed Asphalt

摘要: 泡沫沥青作为近年来新兴的一种冷拌再生稳定剂，用其稳定沥青混合料在材料性能评价、低碳环保方面均有较为理想的效果，具有独特的优势及发展成果。为明晰泡沫沥青中水分对沥青性能的影响，选用SK90#沥青作为基质沥青，通过动态剪切流变试验(DSR)、弯曲梁流变试验(BBR)及傅里叶红外光谱仪(FTIR)对其高低温流变性能与微观性能进行表征。结果表明，发泡用水对沥青高温流变性能具有不利影响，并且随着用水量增加，高温流变性能降幅逐渐增大；发泡用水增加使沥青低温脆性和蠕变劲度增强，应力松弛性能变差，低温流变性能受负面影响；沥青在经过发泡用水后微观性能与基质沥青相似，无新官能团，即发泡用水过程为物理变化。

Abstract: Foam asphalt as an emerging cold-mix regeneration stabilizer in recent years, with its stabilization of asphalt mixtures in the evaluation of material properties, low-carbon environmental protection has more satisfactory results, with unique advantages and development results. In order to clarify the effect of water in the foam asphalt on asphalt performance, SK90# asphalt was selected as the matrix asphalt, and its high and low temperature rheological properties and microscopic properties were characterized by Dynamic Shear Rheology (DSR), Bending Beam Rheology (BBR), and Fourier Transform Infrared Spectroscopy (FTIR). The results show that the foaming water has an adverse effect on the high temperature rheological properties of asphalt, and the decrease of high temperature rheological properties gradually increases with the increase of water consumption; the increase of foaming water increases the low temperature brittleness and creep strength of asphalt, and the stress relaxation performance deteriorates, and the low temperature rheological properties are affected by the negative effect; the microcosmic properties of asphalt are similar to those of matrix asphalt after foaming water, and there is no new functional group, that is, the process of foaming water is a physical change.